Electric-machine brush.



, E. F. STER;

ELECTRIC MACHINE BRUSH.

APPLICATION men DEc.12,1913\ nENEwi-:D 00T. e. 1914.

.Patented Nov. 13, 1917.

EDWARD F. STER, .or CHICAGO,

ILLINOIS, AssIGNon rro nDIviUNno. sciiwnrrziin, or CHICAGO, ILLINOIS.

ELECTRIC-MACHINE BRUSH.

Specication `of Letters Patent.

Patented Nov. 13, 191 '7 Application led December 12, 1913, Serial No. 806,166. `Renewed October 8, 1914. Serial No'. 865,779.

vide a simple brush of the character mentioned provided with a fountain means for supplying lubrication between the brush and f its collector ring.` Other objects will appear hereinafter.

The invention consists in the combinations and arrangements of parts hereinafter described and claimed.

The invention will be best understood by reference to the accompanying drawing forming a part of this specification, and in which- Figure 1 is a vertical section taken through a brush holder and brush embodying my invention.

Fig. 2 is a bottom view of the same,

F 3 is a section taken on line 3-3in Fig. 1, and M Fig. il is a bottom view of a cap used on the brush.

rlhe preferred form of construction as illustrated in the accompanying Adrawing comprises a supporting member 5 on which is secured an insulating member Gcarrying a brush holder 7. The brush holder 7 is slit at 3 and provided with a screw 9 adapted to provide an adjustment whereby lthe brushholder may be moved vertically on insulating member 6. A guide 10 is pivoted as at 11 to the holder 7 on a bolt 12, the latter providing a means for adjusting the guide 10 on the holder 7 Mounted for free vertical sliding in the guide 10 is a collector ring brush 13.` This brush is preferably of carbon but may be of any desirable substance. The brush 13 is provided with a perforation therethrough forming a well 14 at its upper end and a long and narrow constricted portion 15 at its lower end.

At the top of brush 13 is a cap 16 loosely tted thereon with an extension 17 extending into the well 14 preventing lateral movement of the cap 16. The cap 16 is further provided with a lug'lS adapted to fit a corresponding recess inthe top of brush 13 preventing the cap from rotary movement on the brush 13. A leaf spring 19 is carried by a disk 20, the latter being secured to the brush holder 7. A lever 21 carries a pin 22 adapted to rest on the upper side of spring 19 l.and upon swinging the lever 21 toward the right hand, the working length of spring 19 is shortened thereby increasing the ressure on cap 1'6. This spring also furnishes the proper amount of pressure of brush 13 on the collector ring 23.

In ltheV ,constricted portion 15 and the lower portion of the well 111 in said brush is a viscous material packed therein by means of a suitable `tamper (not shown). Said viscous material is preferablyfmade up of graphite .and dynamo Yoil in `(piantities substantially four p artsl of the graphite and one part of oil. 0n the top of this viscous material is placed a quantity of oil, in substantially the proportions shown in Fig. 1. Inuse, the oil seeps through the graphite and oil compound, between the collector ring 23 and bottom of brush 13 providing sufficient lubrication therefor to produce the desired result. At intervals new oil is added to the space above the viscous material in the brush 13. A perforation 24 is pro* vided through cap 16 to permit free access of air to well 14 to permit the'free passage of. oil through the viscous compound. The mouth of the constricted portion 15 isprovided as long and narrow as possible in order to cover as wide a surface of the ring 23 as possible.

tWhile I have illustrated and described the preferred form of construction for carry ing my invention into effect, this is capable of variation and modification without departing from the spirit of the invention. I, therefore, do not wish to be limited to the precise details of construction set forth, but desire to avail myself of such variations and modifications as kcome within the scope of the appended claims.

Having described my invention what I claim as new and desire to secure by Letters Patent is:

1. A device of the kind described compris ing a brush member having a perforation therethrough and a recess at the top of said therethrough and a recess at the top of said perforation; and a cap on said brush member having a portion extending into said perforation and a lug disposed in said re.- cess, there being an opening through said cap permitting the free passage of air toi said perforation7 substantially as described.

3. A device of the kind described comprising a brush member having a perforation therethrough and adapted to contain lubricating material, said brush having a recess at the top of said perforation opening upwardly; a cap on said brush member having a portion extending into said perforation; and a lug disposed in said recess preventing torsional movement of said cap, therebeing an opening through said cap permitting the free passage of air through said cap, substantially as described.

il. A device of the class specified comprising a brush made entirely of carbon material, said brush having a cavity or chamber formed in said carbon material and providing a reservoir, and having an outlet also formed in said material and extending from the reservoir to the Wearing surface of the brush. A

5. A device of the class specified comprising a brush having a reservoir7 a cap fitted loosely upon the top of said brush and covering said reservoir, and spring means normally acting upon said cap to maintain the same in position upon said brush.

6. A device of the class specified comprising a brush member provided with a reservoir chamber near its upper end, in combination With a cap fitted loosely upon the upper end of said brush member and having a depending portion adapted to iit into said chamber.

7 A device of the class specified comprising a brush provided with a reservoir, a cap fitted loosely upon the top of said brush for closing said reservoir, a spring applied to said cap for holding the same normally in position, and means for adjusting the tension of said spring, said means comprising a member adapted to press against the spring and arranged for movement along the length of said spring so as to exert more or less pressure thereupon.

8.v The combination of a brush member having its upper end provided with a reservoir chamber', a cap fitted over the top of said brush member and closing the upper end of said reservoir7 a spring applied to said cap for holding the same normally in position, and means for adjusting the tonsion of said spring, said means comprising a pivoted lever 21 having a pin 2Q adapted to move along said spring.

9. A device Lof the class specified comprising a brush made entirely of carbon material and provided with a reservoir and an outlet passage therefrom to the Wearing surface of the brush, a cap fitted loosely to the upper end of the brush and closing the reservoir7 and a spring applied to said cap for holding the same normally in position to close said reservoir.

10. A device of the class specified comprising a brush made entirely of carbon material and provided with a reservoir and an outlet passage therefrom to the Wearing surface of the brush, a cap fitted loosely to the upper end of the brush and closing the reservoir, said cap being made of insulating material, and a spring applied to said cap for holding the same normally in position to close said reservoir.

In testimony whereof I have signed my name t0 this specification in the presence of two subscribing Witnesses.

EDWARD F. STER.

Vitnesses: Y

JOSHUA R. H. Po'r'rs7 HELEN F. LrLLis.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

